From Sparkall to Squerall v0.2

An evolution of the previously-called Sparkall. Now Presto can be used as a query engine along Spark. It is made available as a second release though. Users can now declare query-time transformations to enable data joinability (using FNO and RML).

v0.1

First working release meant for researchers to try out Sparkall. For production deployment, contact the owner.